RIBE sockets Polydrive for calipers
 

After many hours of searching for the RIBE sockets, a note from one of our Pelican friends led me to this site: List of screw drives - Wikipedia, the free encyclopedia

The following is the definition of a Polydrive also known as RIBE socket

Polydrive/RIBE sockets


The polydrive screw drive is spline shaped with rounded ends in the fastener head. The tool has six flat-tip teeth at equal spacing; the sizes are determined by the diameter of the star points. Its primary advantage over older screw drives is that it resists camming out. It is used primarily in the automotive industry in high-torque applications, such as brakes and driveshafts.
There are some vendors on amazon selling ribe sockets that are not ribe, Tools for the trade carries a set for ? 39 bucks.